DYNAMICS OF REVERSIBLE NETWORKS

被引:642
作者
LEIBLER, L [1 ]
RUBINSTEIN, M [1 ]
COLBY, RH [1 ]
机构
[1] EASTMAN KODAK CO, CORP RES LABS, ROCHESTER, NY 14650 USA
关键词
D O I
10.1021/ma00016a034
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We present a model for dynamics of entangled networks made up of linear chains with many temporary cross-links. At times shorter than the lifetime of a cross-link such networks behave as elastic rubbers (gels). On longer time scales the successive breaking of only a few cross-links allows the chain to diffuse along its confining tube. The motion of a chain in this hindered reptation model is controlled by the concentration and lifetime of tie points. We calculate the self-diffusion coefficient and discuss the stress relaxation in terms of molecular parameters, including the chain length, the number of cross-linking groups per chain, and the lifetime and probability of formation of cross-links. We find good agreement with recent experiments by Stadler et al. on model thermoplastic elastomers.
引用
收藏
页码:4701 / 4707
页数:7
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